The six-part drama chronicles the controversial real-life conviction of Grace Marks (11.22.63‘s Sarah Gadon), an Irish immigrant who becomes a Canadian domestic servant and is later sentenced to prison for the murders of her employer Thomas Kinnear (Paul Gross) and his housekeeper Nancy Montgomery (True Blood‘s Anna Paquin). Chuck‘s Zachary Levi — who co-stars in the miniseries — pops up briefly in the trailer as well.